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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
| Manufacturer | Online Development Inc. (OLDI) |
| Model Number | 56SAM-844 |
| Platform Compatibility | Allen-Bradley ControlLogix (1756 Chassis) |
| Module Type | Special Application Module (SAM) / Coprocessor |
| Operating System | Embedded Linux Environment |
| Communication Interfaces | 10/100 Mbps Ethernet Ports |
| Backplane Power Draw | 5 VDC @ 1.5 A / 24 VDC @ 0.1 A |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Dimensions | Single-Slot ControlLogix Form Factor (3.2 x 14.6 x 14.0 cm) |
| Weight | 0.3 kg (0.66 lbs) |
Product Introduction & Supply Chain Strategy
The OLDI 56SAM-844 is an in-rack Special Application Module (SAM) designed for the Allen-Bradley ControlLogix 1756 platform. It provides a dedicated Linux computing environment directly inside the PAC chassis, allowing custom C/C++ algorithms, proprietary math models, and Linux-based communications to interface natively with the ControlLogix backplane.
Procuring the 56SAM-844 as New Surplus is a critical risk-mitigation strategy for facilities running legacy ControlLogix architectures. Because OLDI has discontinued this specific module line, sourcing an unused, factory-fresh unit prevents catastrophic downtime caused by co-processor failure. Maintaining strategic buffer stock eliminates the need for emergency, high-cost control system engineering retrofits while avoiding the reliability pitfalls of degraded, second-hand parts.
Installation & Configuration Guide
1.Pre-Installation (Prep & Safety):LOTO, system backup, and ESD preparation.
Isolate power to the 1756 ControlLogix chassis and apply lock-out/tag-out (LOTO) procedures. Put on a grounded ESD wrist strap before handling the module. Perform a full backup of the ControlLogix processor project file (.ACD) and document existing network configurations (IP address, subnet mask, gateway) assigned to the 56SAM-844 module.
2.Removal:Removing the failing module.
Disconnect all RJ45 Ethernet cables attached to the front panel of the module. Press the top and bottom chassis locking tabs simultaneously to disengage the card from the 1756 backplane. Slide the old 56SAM-844 straight out of the chassis slot, taking care not to twist or force the card against adjacent I/O modules.
3.Installation (Clone & Seat):Physical installation and seating.
Inspect the backplane connector pins on the new OLDI 56SAM-844 to confirm zero damage or oxidation. Align the card with the target chassis slot guides. Slide the module into the slot until the top and bottom retaining tabs snap firmly into the chassis frame, ensuring full backplane engagement. Reconnect network communications cables to the front panel ports.
4.Power-On & Testing:Power-up, network config, and application load.
Re-energize the ControlLogix chassis power supply. Observe the front-panel status LEDs (OK, ENET, RUN) during the Linux boot sequence. Connect via the dedicated maintenance port to reload application code or restore Linux system parameters if necessary. Verify backplane communication tags in Studio 5000 / RSLogix 5000 to ensure data exchange between the Logix CPU and the 56SAM-844.
56SAM-844
56SAM-844
Firmware/Software Versions & Upgrade Notes
- Studio 5000 / RSLogix 5000 Setup: Configured in the Logix I/O tree as a Generic 1756 Module or via the OLDI-supplied Electronic Data Sheet (EDS) file.
- Linux Environment Parity: Ensure the custom C/C++ application binary compiled for the original 56SAM-844 matches the Linux runtime version pre-installed on the replacement module to prevent runtime execution faults.
- Compatibility Caution: Do not pull or insert the 56SAM-844 while the 1756 backplane is actively processing heavy I/O cycles. Although ControlLogix supports Removal and Insertion Under Power (RIUP), performing live swaps during active Linux flash writes can corrupt onboard application memory.
Frequently Asked Questions (FAQ)
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability.
Why choose New Surplus over a refurbished or pulled OLDI module?
In-rack co-processors run complex operating systems and experience continuous thermal stress inside PLC chassis. Refurbished or pulled modules frequently suffer from degraded flash memory cells, dried-out onboard capacitors, or weakened backplane contacts. Purchasing New Surplus guarantees factory-fresh flash memory cycles, pristine backplane connectors, and full operational lifespan without risking unpredicted processor halts.
How do you verify the condition of the 56SAM-844?
Our quality engineering team inspects every 56SAM-844 unit upon arrival. We confirm zero insertion wear on the backplane gold contacts, check for intact solder joints, verify clean housing plastics, and ensure the unit is stored in an ESD-safe environment prior to shipment.
What function does the 56SAM-844 serve in a ControlLogix chassis?
The 56SAM-844 acts as an in-rack Linux computer. It allows engineers to run high-speed custom code (like advanced math routines, specialized protocol conversions, or database interfacing) that standard Logix ladder logic cannot process efficiently, all while communicating natively over the 1756 backplane.
Is this part directly interchangeable with other OLDI SAM modules?
No. Model numbers denote specific hardware revisions, onboard memory allocations, and network interface options. You must replace a 56SAM-844 with the exact same part number to guarantee backplane configuration and software runtime compatibility.
What warranty is provided with this New Surplus module?
We cover this New Surplus OLDI 56SAM-844 with a full 1-year replacement warranty. If any hardware defect or component failure occurs under standard operating conditions within 12 months, we will immediately replace the module from our inventory.
